Forging ram and rod connection



S. B. HEPPENSTLL FORGING RAM AND ROD CONNECTION May 15, 1934,

Filed lay 1l. 1931 INVENTOR Y v MQ/Wf( WITNESS Patented May l5, 1934 l UNITED STATES PATENT OFFICE FORGING RAM AND ROD CONNECTION Samuel B. Heppenstall, llittsburgh, Pa., assigner to Heppenstall Company, Pittsburgh, Pa., a corporation of Pennsylvania Application May 11, 1931, serial No. 536,485

7 claims. (o1. 287-20) This invention relates to forging hammers and It is my belief that such a coating functions has particularly to do with the connections of the both as a sort of lubricant and as a surfacing mepiston rods to the rams or heads of such hamdum which flows sufiiciently t ll up the Small mers. or microscopic pores or irregularities which oc- In the operation cf hammers of this character cur in the engaging surfaces of the rod and ram 00 it frequently happens that the piston rods on and thereby prevents them from beccming weldwhich the rams are mounted break and have to ed together 0r from interlocking or gripping each be replaced a number of times before the rams are other in Such a Way that they can not be readily worn out or destroyed. The making of these re- Separated When neceSSaryplacements in the pest has been e, Very -dinieult Referring to the embodiment of the invention 65 and tedious task because as a rule the rods usually illustrated in Fig. 1, the numeral 1 deSignateS become very rigidly locked in the rams due to a Conventional form Qf fOrging hammer ram in the heavy hammering t0 which they are Subjeetwhich there is provided a central bore 2 for ed in service. In fact they are often practically the reception of the 10Wer end of a piStOn rod l5 Welded lin the heads as a result of the tremendous 3 to Which the ram iS attached for reeiprocation 70 pressures encountered and have to be removed in the Customary aShiOn through the use 0f a by drilling or boring them out and this not infresuitable iuid pressure mechanism or other similar quently ruins the rams, power means, not shown. To provide a convenient With these difficulties in mind itis an object Way 0f practicing the invention and t0 adapt of this invention to provide a hammer ram and the rain to the uSe 0f any SiZe 0f rod desired, 75 piston rod connection which is adapted to meet as well as to facilitate the replacement of the all the requirements of such a connection and rod When it breaks, a Sleeve 4 iS mounted in the at the same time is adapted to permit the rod bore 2- This SleeVe, aS ShoWn, iS Split aXially being removed from the ram Without injury along one side to allow for expansion and conthereto and with relative ease when necessitated. traction So that it Can be inserted and gripped 80 Another object is to provide a connection emin the bore, and iS preferably made With a bodying the aforementioned characteristics tapered inner Wall Conforming in Shape t0 the which is simple and relatively inexpensive to ram end of the rod 3 Which iS alSO preferably manufacture and both eiiicient and durable in tapered, and a Cylindrical Outer Wall which is service. adapted to fit snugly within the bore with its 85 These and various other Objects, as Well as lower end resting on'an annular ledge 5 provided i the Various other novel features and adv-anin the lower end of the bore for its reception. tages of the invention, will be apparent when In accordance with my invention to prevent the following detailed description is read in conthe Tod 3 from gripping the Sleeve 4 0r becoming junction with the accompanying drawing, of welded to it in such a way in service that it can 90 which Figs. 1 and 2 arevertical sectional views of not be removed Without Considerable difliculty, two piston rod and'ram connections embodying such as drilling in CaSe the rod breaks, a thin the invention, but in which the thickness cf the Coating 0r layer 6 0f Some Suitable Soft metal, metal coatings applied to the contacting surfaces Such as Copper isapplied either over the Outer 40 of the connecting rods and heads is somewhat ex- Surface 0f the lower end 0f the rod 3 Which 95 aggerated. fits in the ram, or onto the inner surface of The invention is predicated upon my discovery the Sleeve 4, as illustrated. 'Illls Coating, that by applying a very thin coating or layer of is shown as exaggerated as to thickness in the some suitable dissimilar metal, and preferably a drawing is made sufficiently thick t0 insure the.

soft metal Such as copper or the Eke, over the easy removal of the rod, but insufficiently thick 100 surface of either the rod or the bore in the ram to be forced out of the joint or to alloW ,the Y or head of a forging hammer where these parts joint to become loose in service. To prevent its engage each other, and by applying it to one or` being crumpled and dislodged or destroyed when the other of these surfaces in such a way that the rod is inserted in the bore 2, in view of its it will not be readily crumpled and destroyed or thinness this coating is made to adhere very 105 displaced when the rod is mounted in the ram, tenaciously to the surfaces to which it is applied. a. very excellent connection is provided and at To attain this end it may be applied to such the same time it adapts the rod to be removed surface in various ways, but preferably this is from the ram with ease and without subjecting accomplished by electroplating. While as indithe head to injury. cated above the thickness of the coating 6 may 110 be varied it has been found in practice that the most satisfactory and excellent results may be obtained when thicknesses varying from 3/1000 to 1/32 of an inch are used.

5 Referring to Fig. 2, an embodiment of the invention is shown iny which the adapter sleeve 4, shown in Fig. 1,"is omitted and in which the lubricating and surface 'separating coating of soft metal 16, which is employed to facilitate the removal of the rod 13, is applied to such rod which is adapted to t into the bore 12 provided in the ram 11. While this comprises the simplest application of the invention, as stated above, instead of attaching the layer of lubricating and separating metal 16 to the outer surface of the piston it may be also applied to the surface of the bore 12.

As will be readily appreciated by those skilled in the art, this invention provides a great saving in time and labor in the operation of a forging hammer, as well as saving of the hammer itself, and, as will be also appreciated, it may be applied to other structures wheresimilar problems are encountered and such is contemplated by the appended claims.

I claim:

1. In a forging hammer, the combination of a ram provided with a taperedrod-receiving bore, a piston rod having a tapered end tightly wedged in said ram bore, and a thin layer of copper interposed between and adhered to one of the contacting surfaces comprising the tapered faces of said bore and rod.

2. In a forging hammer, the combination of a ram provided with a connection-forming opening, a bushing arranged in said opening and provided interiorly with a tapered rod-receiving bore, a piston rod having a tapered end tightly wedged in said tapered bushing bore, and a thin layer of soft metal interposed between and adhered to one of the tapered-contacting faces of said bore and rod.

3. In a forging hammer, the combination of a ram provided with a connection-forming opening, a bushing arranged in said opening and provided interiorly with a tapered rod-receiving bore, a piston rod having a tapered end tightly wedged in said tapered bushing bore, and a thin layer of copper interposed between and adhered to one of the contacting surfaces comprising the tapered faces of said bore and rod.

4. In a forging hammer, the combination of a ram provided With a connection-forming opening, a bushing arranged in said openingand provided interiorly with a rod-receiving bore, a piston rod having an end tightly engaged in said bushing bore, and a thin layer of soft metal tightly adhered to the inner face of said bore.

5. A connection comprising a metal work element of the type subjected to impacts in use and having a bore therein for the reception of a connecting rod, a metal connecting rod rigidly connected in said bore, and a thin coating of soft metal interposed between the contacting surfaces of said rod and bore and tightly adhered to one of such surfaces.

6. A connection comprising a metal work -element of the type subjected to impacts in use and having a bore therein for the reception of a connecting rod, a metal connecting rod rigidly engagedin said bore, and a thin coating of soft metal electroplated onto one of the contacting surfaces of said rod and element.

'7. For use in engaging a metal connecting rod in a bore in a metal work element of the type subjected to compressive forces in operating a metal sleeve provided with a bore for the reception of a metal connecting rod having a thin face of soft metal electroplated onto the surface of the bore which is adapted to engage such a rod.

SAMUEL B. HEPPENSTALL. 

